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Cleanup centerOnBlock. (#3699)

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This commit is contained in:
Monica Kozbial
2020-02-24 13:35:36 -08:00
committed by GitHub
parent 981c0b5d12
commit 4432ca2e93
1 changed files with 7 additions and 12 deletions
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19
core/workspace_svg.js
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@@ -2075,31 +2075,26 @@ Blockly.WorkspaceSvg.prototype.centerOnBlock = function(id) {
// Workspace scale, used to convert from workspace coordinates to pixels.
var scale = this.scale;
// Center in pixels. 0, 0 is at the workspace origin. These numbers may
// be negative.
// Center of block in pixels, relative to workspace origin (center 0,0).
// Scrolling to here would put the block in the top-left corner of the
// visible workspace.
var pixelX = blockCenterX * scale;
var pixelY = blockCenterY * scale;
var metrics = this.getMetrics();
// Scrolling to here would put the block in the top-left corner of the
// visible workspace.
var scrollToBlockX = pixelX - metrics.contentLeft;
var scrollToBlockY = pixelY - metrics.contentTop;
// viewHeight and viewWidth are in pixels.
var halfViewWidth = metrics.viewWidth / 2;
var halfViewHeight = metrics.viewHeight / 2;
// Put the block in the center of the visible workspace instead.
var scrollToCenterX = scrollToBlockX - halfViewWidth;
var scrollToCenterY = scrollToBlockY - halfViewHeight;
var scrollToCenterX = pixelX - halfViewWidth;
var scrollToCenterY = pixelY - halfViewHeight;
// Convert from workspace directions to canvas directions.
var x = -scrollToCenterX - metrics.contentLeft;
var y = -scrollToCenterY - metrics.contentTop;
var x = -scrollToCenterX;
var y = -scrollToCenterY;
Blockly.hideChaff();
this.scroll(x, y);
};